133 lines
4.5 KiB
C
133 lines
4.5 KiB
C
/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* Copyright 2012 Marek Olšák <maraeo@gmail.com>
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/* A simple allocator that suballocates memory from a large buffer. */
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#include "pipe/p_defines.h"
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#include "util/u_inlines.h"
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#include "pipe/p_context.h"
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#include "util/u_memory.h"
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#include "util/u_math.h"
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#include "u_suballoc.h"
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struct u_suballocator {
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struct pipe_context *pipe;
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unsigned size; /* Size of the whole buffer, in bytes. */
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unsigned alignment; /* Alignment of each sub-allocation. */
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unsigned bind; /* Bitmask of PIPE_BIND_* flags. */
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unsigned usage; /* One of PIPE_USAGE_* flags. */
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boolean zero_buffer_memory; /* If the buffer contents should be zeroed. */
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struct pipe_resource *buffer; /* The buffer we suballocate from. */
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unsigned offset; /* Aligned offset pointing at the first unused byte. */
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};
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/**
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* Create a suballocator.
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*
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* \p zero_buffer_memory determines whether the buffer contents should be
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* cleared to 0 after the allocation.
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*/
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struct u_suballocator *
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u_suballocator_create(struct pipe_context *pipe, unsigned size,
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unsigned alignment, unsigned bind, unsigned usage,
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boolean zero_buffer_memory)
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{
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struct u_suballocator *allocator = CALLOC_STRUCT(u_suballocator);
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if (!allocator)
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return NULL;
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allocator->pipe = pipe;
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allocator->size = align(size, alignment);
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allocator->alignment = alignment;
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allocator->bind = bind;
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allocator->usage = usage;
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allocator->zero_buffer_memory = zero_buffer_memory;
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return allocator;
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}
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void
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u_suballocator_destroy(struct u_suballocator *allocator)
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{
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pipe_resource_reference(&allocator->buffer, NULL);
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FREE(allocator);
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}
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void
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u_suballocator_alloc(struct u_suballocator *allocator, unsigned size,
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unsigned *out_offset, struct pipe_resource **outbuf)
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{
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unsigned alloc_size = align(size, allocator->alignment);
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/* Don't allow allocations larger than the buffer size. */
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if (alloc_size > allocator->size)
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goto fail;
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/* Make sure we have enough space in the buffer. */
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if (!allocator->buffer ||
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allocator->offset + alloc_size > allocator->size) {
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/* Allocate a new buffer. */
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pipe_resource_reference(&allocator->buffer, NULL);
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allocator->offset = 0;
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allocator->buffer =
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pipe_buffer_create(allocator->pipe->screen, allocator->bind,
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allocator->usage, allocator->size);
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if (!allocator->buffer)
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goto fail;
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/* Clear the memory if needed. */
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if (allocator->zero_buffer_memory) {
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struct pipe_transfer *transfer = NULL;
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void *ptr;
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ptr = pipe_buffer_map(allocator->pipe, allocator->buffer,
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PIPE_TRANSFER_WRITE, &transfer);
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memset(ptr, 0, allocator->size);
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pipe_buffer_unmap(allocator->pipe, transfer);
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}
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}
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assert(allocator->offset % allocator->alignment == 0);
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assert(allocator->offset < allocator->buffer->width0);
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assert(allocator->offset + alloc_size <= allocator->buffer->width0);
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/* Return the buffer. */
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*out_offset = allocator->offset;
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pipe_resource_reference(outbuf, allocator->buffer);
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allocator->offset += alloc_size;
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return;
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fail:
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pipe_resource_reference(outbuf, NULL);
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}
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